Genetic Analysis of Virescent Mutants in Cotton.

Seven potential yellow-foliage mutants were found in Upland cotton (Gossypium hirsutum L.), and progeny tests proved three to be genetically controlled. These three mutants were classed as virescents, two of which were found to be alleles of known virescent mutants, virescent-2 (v2) and virescent-4 (v4). However, results indicate that the remaining mutant is not an allele of any of the known virescent-yellow mutants. It is a complete recessive and is controlled by a single locus that causes virescent-yellow foliage when the recessive alleles are homozygous. Linkage tests indicate that it is an independent mutant, not linked to any of the known mutants tested. It is proposed that this new virescent mutant be named virescent-3 and assigned the gene symbol v3\\; the homozygous mutant genotype will thus be v3v3.